Electric selective instrument.



T. BODDE.

ELECTRIC SELECTIVE INSTRUMENT.

APPLICATION FILED 02c. so, 907.

169,713. Patented Jan. 25, 1916.

5 L F P- W "53558: nlvsmn' "Tourist-z UNITED STATES PATENT nnmcn.

THEODORE BODDE, (3F \VESTFIELD, NEW JEBSEY, ASSIGNOR OF ONE-'HALF TO HEAR-15213 AND ONE-HALF T0 ARCHIE G. SHAVER, OF KVES'IFLELD. NEW JERSEY.

ELECTRIC SELECTIVE INSTRUMEN I,

Application filed December 30, 1907.

in the Suzie w? Ne Jimw, have invented :1

Th. 1 'nmiy rill .l ml my invention is tlir pinzlnrliula 0i arr-. 2; 21-.1 or selmttim insurmnrni \\'lll .lll ill imuiiiy and reliably rvispnt l in ;z vermin way to u flow of an Glenn-iv vnrrcnl of inf: claim. and will rosponii in a, iiiilkiint 11v, 01' not at all, to n flow ul' Llil'llflit of u ili .ienrnt clmracler. My novui i etrunuuit e ipcciully ldupifill for 1min -ignul s i'--1tci';:-.

'ilw; 'l'lwliirvs of nm'elty which 31mmuzl'rrim my 1: \vrrion are. pointed out il; iiziiiuilntiiy in 1114': claims annexed to and firming"; a part of this specification. I i w 'm-ltvr iniilcrstunrliiif 01" any invention, l1 i\\('!\ er. and [ii-. :uiwxniuge: poswssed by ill, rrlcmncr may bu 111117. in the mrcmnpnnying \ll'FlWii 1C1 il 'mcriptiw matter in \rlr l; l have illwstratml and (ltSil'ilJkHl snmn of tire inrni? i i'liiuli lilo inrentiun 11:1} lh A I i 1:2! iisrl'ul improvement in "rl'iw izwtz'umenh. iii which the ire 11ml ma i description, him to time -i1ccmnpnm'iug l. form :1 will thereof.

l igz iw 1 is a View partly 91ml) diagrammatic of mi] m l will i vriirii insiruinem. Fig. 3 mil mulimi fnkmi on (in: line i '2 i lili am lnrgnr scale than ilw 11mins fin adjusting xvi lw spring cunmrr. .w-iiun 1.11m on the i U; k an i; m'ziiiwn :1 gimlirm of u svlwtii'u instrument differ- Y in wine rmpu'tf-i from that shy-W11 in .lig. 1. Fig. I; n zlizzgvxnmmtic represen- Lltiun of :1 mmlilivutim; wl' he instrmnent sluwrn by Fig. 1 in whirl: there arr two sets 1 J'XELIU" iml lirvala (l((l 0s mini flannel-Ming Specification of Letters Patent.

$cria1 No. 408514.

1 comprishs u magnetizing cnil polarized core A". a resilient mm. porting an :u'nmture ii :11. ii; iii

inLcrmitLQr-dly mgr wlirn the utter is wt in \ilizaimi winding R adapted win-n vii-" tions. ()ne tor? trimlly (-0111; V other M r ul' sly connected in ilio a inserted in tho fLTYHEiU IlUZL l:-i -tv'e:..=i in: 1x ll and the spri: necteil ii shin: w

sprang l5. :2: i I (lint iizrrnziting fi PUlHzlllllgL cni'rvnt is PM-H through m:- winiung uf rho mini 1 .ll, armature sun-- poi-(ml in Lin? spring ii \iii lm mirrin :f'lv i5 its natural perivil of viln'zifiun equal in the l H'IiiP-lllltjy' (if Inn nnwzirili: impulses prmlurvrl by tl. para" ".zr-

proper magnitmiv PHI} l'w llzl 'i relay R so iulrl as the Spring i" n2ifZ8S the SPI'QW F The arran neniw give a simple and iiifliflg and i strumenl, If the .e'iurrvnt flnwi the coil. A i; dilfii irnrrvnh or i. .Q the proper frequency. lIlKf a? parted. by the spring B wiil the impulses which are necessary to cause the desired amplitude of vibration. By suitably constructing the spring B its period of vibration can of course be made whatever is necessary. \Vith a given spring B the period of vibration can be adjusted to some extent as by varying its effective length by means of the vertically adjustable yoke B shown best in Fig. 2.

The arrangement shown in Figs. 3 and a (litters from that of Figs. 1 and 2 principally in the fact that a magnetizing coil F surrounds a resilient body J of magnetic material which forms a magnetic shunt across the center of a rectangular magnet core L having a rectangular opening or window in it. ()no end of the body J free and the other is held in a suitable holder, but on account of its own resilience the body J is, in effect, spring supported. One side of the core L immediately adjacent the free end of the spring J is preferably cut away as indicated at L to increase the reluctance of this portion of the core and is surrounded by the coil M. By passing currents of the desired characteristics through the coils F and M the spring J may be set into suitable vibratiois to intermittently engage the adjustable contact K. The contact K and spring J may be connected it will be under stood with a relay coil, battery, and con denser in like manner as are the contacts E and spring B of Fig. 1. The vibration of the spring J may be set up in different ways. For instance, the coil F may be constantly energized by direct current, and the coil M receive the variable current. In this case the spring J will be set into strong vibration when the frequency of the current flowing through coil M is of the proper value. If the coil M is energized with direct current, and the coil F with alternating current the spring will be set into strong vibration when the. current through coil F is of the proper frequency.

In the arrangements shown in"Figs. 5 and 6 the instrument of Figs. 3 and 4. is modified by providing a pair of contacts K one at each side of the spring J. The contacts K are mounted in a yoke N which is frictionally held with some force in any position into which it may be moved, by its fulcrum screw 0 and a friction washer between the head of the screw and the yoke N. By this arrangement the distance between the normal position of the spring and each contact will be automatically equalized through the engagement of the contacts by the vibrating spring. A relay R, battery G, and condenser I are employed in conjunction with each contact K and the spring J. When these relays are employed for controlling a single electric circuit which is broken at two points when the two relays It are deenergized an advantage is had over such an arrangement as is shown in Fig. 1 from the fact that a strong direct current flowing through whichever of the coils M and F is employed as the variable current coil and holding the spring J out of its normal position and in engagement with one of the contacts K will not result in operatively closing the con trolled circuit.

In the modification shown in Fig. 7, the spring supported armature and contact E of Fig. 1 are duplicated at each end of the mag netizing coil A. This arrangement may be employed in conjunction with two sets of re lays R, battery G and condensers I. If the two springs B and C at opposite ends of the coil A have different vibration frequencies. one spring will respond to a. flow of current through the coil A of one frequency and the other to a flow of current of a dill'erent fre quency. Instead of two batteries G there may be but one, as in the instrument of Fig.9. The instrument of Fig. 7 has the advantage over the instruments like Fig. 1 connected in series or shunts with each other in the same circuit that the number of parts, space occupied and material required are re duced.

The arrangement shown in Fig. 8 is a modification upon the lines of Fig. 7 of the construction shown in Figs. 3 and 4. In this form of the invention the rectangular core has two windows formed in it, the side legs L being connected by a central leg L which is surrounded by the coil M. A .coil F, spring J, and contact K are mounted in each window of the core in operative relation with the single coil M.

The apparatus hereinhefore described, while capable of operation in many difl'erent relations, is particularly adapted for use in electric railway block signal systems. For instance, these selective devices may be used in a block signal system of the general char acter described and claimed in my copending application Ser. No. 393,6i0, filed the 19th day of'september, 1907, in which the track rails are divided into sections by cross bonds, and alternating current for signal purposes is supplied to each section at a point approximately midway between the ends of the section, alternating currents of frequencies differing from each other and also from the frequency of the power current flowing along the track rails if the latter is alternating and not direct, being supplied to adjacent sections. In such a system my new selective devices may be employed to respond to the current flow through the track crossbond and energize the track re lays at the proper time.

I do not wish the claims hereinafter made to be limited to the particular embodiment disclosed more than is made necessary by the state of the art.

Having now described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A selective instrument for responding to electro-magnetic impulses of predetermined, frequency, comprising in combination a member free to vibrate and having a natural frequency of vibration corresponding to said predetermined frequency and tending to be set in vibration by said electromagnetic impulses, means for subjecting said member to electromagnetic impulses of said predetermined frequency, an electric circuit including a source of current and having a gap clpsed by said'vibrating memher once in each vibration ofpredetermined amplitude, a condenser in shunt to said gap, and means responding to aflow-of current ,throughsaid circuit. r r 2.v A selective instrument for. responding to a particular non-continuous electric current, including; in combination a winding along whlch the current passes, an armature within the electromagnetic influence of said f winding and free to vibrate and having a vibration frequency corresponding to the frequency of magnetic-impulses produced by said particular current, an electric circuit including an electro-magnet winding,

a source of direct current, a stationary contact surface, anda movable contact surface caused to engage: the stationary contact sur face. and close the circuit at each armature vibration of the amplitudeproduced byusaid particular current, and a condenser in shunt to said contact surfaces.

-3. In a selective instrument, the combination of a winding through which the current to be responded to may pass, an armature in electro-r'nagnetic relation to said 40 Winding and free to yibrate and'having a natural period of vibration corresponding -to the frequency of the'magneticimpulses.

produced in said winding by the current to be responded to, a contactadapted to be engaged by 'said armature at one limit'of its vibration'when the vibrations are of the predetermined amplitude, a winding of an electro-magnet, and a source of direct current connected in series betweenjgthe armature and said contact, and a eo'iidenser in shunt to said centact and armatiire.

4. In'combination, an armat i ire having one end free and the other resiliently supported whereby said body is free to vibrate and has a natural vibration I frequency,

means for magnetizing it in'the direction of its length, and means for creating a mag netic field adjacent its free end extending transverse to the direction of the armature. 0 one of said magnetizations being produced by a variable current, whereby when said variable current is of the proper frequency relatively large vibrations of the armature are produced, and a contact engaged by said by va variablecurrent, whereby when saidvariable currentis of the proper frequency relatively large vibrations of the armature are produced, and apair of contacts, one engaged at each limit of said large vibrations, and electric flow controlling means actuated by and dependent on the alternate engagements of said armature with the twoacon tactsr 6.'In combination, an armature, having one end free and the other resiliently supported whereby said body is free to vibrate and has a. natural vibration frequency, means for magnetizing it in the direction of its length, and means for creating a mag-- netic field adjacent its free end extending transverse to the direction of the armature, one ofsaid magnetizations being produced by variable current, whereby when said variable current is of the/proper frequency relatively large vibrations ,pf ;the armature are produced, and a pair of contacts, one

engagedat each limit of said large vibrations, and a yielding support for said pair of contacts whereby they may adjust them-.

selves at equal distances from the rest position of said armature.-

7. In combination, a core forming a closed magnetic circuit, a magnetic shunt extending across said circuit and haying one end free and the other resiliently supported, whereby said shunt is free to vibrate and has a natural vibration frequency, a magnetizing coil surrounding saidshunt, a second magnetizing'coil surrounding the portion of the core in front of the free end of said shunt, means for passing a continuous current through one of said coils, and

means for passing a variable current through the other coil whereby when said variable current isof a frequencycorresponding to said vibration frequency relatively large vibrations of said shunt are produced.

I THEODORE BCDDE. W itnesses: 4

A. K. GALE,

F, K. WINTER. 

